Nineteen ISO 8879:1986 character entity sets used by many DTDs:

  Added Latin 1
  Added Latin 2
  Added Math Symbols: Arrow Relations
  Added Math Symbols: Binary Operators
  Added Math Symbols: Delimiters
  Added Math Symbols: Negated Relations
  Added Math Symbols: Ordinary
  Added Math Symbols: Relations, Box and Line Drawing
  Alternative Greek Symbols
  Diacritical Marks
  General Technical
  Greek Letters
  Greek Symbols
  Monotoniko Greek
  Non-Russian Cyrillic
  Numeric and Special Graphic
  Publishing
  Russian Cyrillic
